i am getting a runtime error for a leetcode find lucky integer in array problem, it works fine in dev cpp but shows error in leetcode

Question

class Solution {
public:
    int findLucky(vector<int>& arr) {
    sort(arr.begin(),arr.end());
    int count=1;
    int l=-1;
    for(int i=0;i<arr.size();i++){
        if(arr[i]==arr[i-1]){  
            count=count+1;
        }
        if(arr[i]!=arr[i-1]){
            count=1;
        }
        if(count==arr[i]){
            l=arr[i];
        }
        if(count==arr[i]&& arr[i]>l){
            l=arr[i];
        }
        
        
    }
        return l;
        
    }
};

Runtime Error Message: Line 1034: Char 34: runtime error: addition of unsigned offset to 0x602000000090 overflowed to 0x60200000008c (stl_vector.h) SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/stl_vector.h:1043:34

pm100 · Accepted Answer · 2022-06-02 00:39:41Z

0

well for a start this leads to UB

for(int i=0;i<arr.size();i++){
    if(arr[i]==arr[i-1])

when i = 0 you are accessing arr[-1]

answered Jun 2, 2022 at 0:39

pm100

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